WO2000008817A3 - System and method for filtering data - Google Patents

System and method for filtering data Download PDF

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Publication number
WO2000008817A3
WO2000008817A3 PCT/US1999/017501 US9917501W WO0008817A3 WO 2000008817 A3 WO2000008817 A3 WO 2000008817A3 US 9917501 W US9917501 W US 9917501W WO 0008817 A3 WO0008817 A3 WO 0008817A3
Authority
WO
WIPO (PCT)
Prior art keywords
filtering
data
rule
protocol
rules
Prior art date
Application number
PCT/US1999/017501
Other languages
French (fr)
Other versions
WO2000008817A2 (en
Inventor
Alex E Henderson
Walter E Croft
Original Assignee
Fast Chip Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fast Chip Inc filed Critical Fast Chip Inc
Priority to DE69942203T priority Critical patent/DE69942203D1/en
Priority to AU53322/99A priority patent/AU5332299A/en
Priority to AT99938946T priority patent/ATE463115T1/en
Priority to EP99938946A priority patent/EP1103129B1/en
Publication of WO2000008817A2 publication Critical patent/WO2000008817A2/en
Publication of WO2000008817A3 publication Critical patent/WO2000008817A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/90—Buffering arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/90—Buffering arrangements
    • H04L49/901—Buffering arrangements using storage descriptor, e.g. read or write pointers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/90—Buffering arrangements
    • H04L49/9021—Plurality of buffers per packet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/0227—Filtering policies
    • H04L63/0263—Rule management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/564—Enhancement of application control based on intercepted application data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/161—Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/0227—Filtering policies
    • H04L63/0236—Filtering by address, protocol, port number or service, e.g. IP-address or URL
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
    • H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • General Business, Economics & Management (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
  • General Engineering & Computer Science (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Image Processing (AREA)
  • Complex Calculations (AREA)

Abstract

A system for filtering data comprises a filtering database for storing layered rule tables and a data filtering engine coupled to the filtering database for filtering the input data using the layered rule tables. The data filtering engine filters or classifies input data using tests or rules performed on the data elements in the input data. The data elements are segments of data in the input data and are selected from the input data using a data element locator. Preferably, each rule table in the filtering database comprises a data element locator, a default rule, and zero or more filtering rules. The filtering rules comprise the tests or rules that are to be applied to the data elements. Each rule table corresponds to a single data element and each filtering rule in the rule table is to be applied to that data element. In one embodiment, the system filters or classifies packets using tests or rules performed on protocol elements in the packet. Protocol elements are fields in the packet defined by a communication protocol and are selected from the packet using a protocol element locator. Each rule table in the filtering database comprises a protocol element locator, a default rule, and zero or more filtering rules. The filtering rules comprise the tests or rules that are to be applied to the protocol elements. Each rule table corresponds to a single protocol element and each filtering rule in the rule table is to be applied to that protocol element. Preferably, a packet filtering engine comprises a packet data buffer for storing portions of the packets, a rule evaluator for selecting the protocol element from the packet and for applying a filtering rule to the selected protocol element, and a protocol element locator buffer for storing the protocol element locator. The filtering database preferably comprises layered rule tables wherein a single rule table corresponds to a protocol element.
PCT/US1999/017501 1998-08-07 1999-08-02 System and method for filtering data WO2000008817A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE69942203T DE69942203D1 (en) 1998-08-07 1999-08-02 METHOD AND DEVICE FOR DATA FILTERING
AU53322/99A AU5332299A (en) 1998-08-07 1999-08-02 System and method for filtering data
AT99938946T ATE463115T1 (en) 1998-08-07 1999-08-02 METHOD AND DEVICE FOR DATA FILTERING
EP99938946A EP1103129B1 (en) 1998-08-07 1999-08-02 System and method for filtering data

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US9582598P 1998-08-07 1998-08-07
US60/095,825 1998-08-07
US09/240,919 US7133400B1 (en) 1998-08-07 1999-01-29 System and method for filtering data
US09/240,919 1999-01-29

Publications (2)

Publication Number Publication Date
WO2000008817A2 WO2000008817A2 (en) 2000-02-17
WO2000008817A3 true WO2000008817A3 (en) 2000-08-24

Family

ID=26790662

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/017501 WO2000008817A2 (en) 1998-08-07 1999-08-02 System and method for filtering data

Country Status (6)

Country Link
US (1) US7133400B1 (en)
EP (1) EP1103129B1 (en)
AT (1) ATE463115T1 (en)
AU (1) AU5332299A (en)
DE (1) DE69942203D1 (en)
WO (1) WO2000008817A2 (en)

Families Citing this family (87)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6567408B1 (en) 1999-02-01 2003-05-20 Redback Networks Inc. Methods and apparatus for packet classification with multi-level data structure
US6560230B1 (en) 1999-02-01 2003-05-06 Redback Networks Inc. Packet scheduling methods and apparatus
US6449650B1 (en) 1999-02-01 2002-09-10 Redback Networks Inc. Methods and apparatus for deploying quality of service policies on a data communication network
US6529508B1 (en) 1999-02-01 2003-03-04 Redback Networks Inc. Methods and apparatus for packet classification with multiple answer sets
US6873600B1 (en) * 2000-02-04 2005-03-29 At&T Corp. Consistent sampling for network traffic measurement
US6901080B1 (en) * 2000-04-10 2005-05-31 Siemens Communoications, Inc. System and method for providing an intermediary layer for VoIP call pipe establishment
EP1279268A2 (en) * 2000-05-03 2003-01-29 David Skillicorn Characterizing network traffic from packet parameters
WO2002015521A1 (en) * 2000-08-17 2002-02-21 Redback Networks Inc. Methods and apparatus for packet classification with multi-level data structure
US7369554B1 (en) * 2000-12-22 2008-05-06 Nortel Networks Limited Method and apparatus for performing filter operations on data packets using an instruction
FR2823329B1 (en) * 2001-04-09 2003-06-13 Canon Kk METHOD AND DEVICE FOR FILTERING DATA PACKETS
FR2823926B1 (en) * 2001-04-19 2004-06-04 Scm Schneider Microsysteme Dev METHOD AND DEVICE FOR PROCESSING DATA OF A MULTIPLEX STREAM
EP1267568A1 (en) * 2001-06-11 2002-12-18 STMicroelectronics Limited A method and circuitry for processing data
US20020191621A1 (en) * 2001-06-14 2002-12-19 Cypress Semiconductor Corp. Programmable protocol processing engine for network packet devices
US20030014532A1 (en) * 2001-07-16 2003-01-16 Shean-Guang Chang Method and apparatus for multicast support
US7209962B2 (en) 2001-07-30 2007-04-24 International Business Machines Corporation System and method for IP packet filtering based on non-IP packet traffic attributes
WO2003021906A1 (en) * 2001-08-29 2003-03-13 Nokia Corporation Method and system for classifying binary strings
US20050002388A1 (en) * 2001-10-29 2005-01-06 Hanzhong Gao Data structure method, and system for multimedia communications
EP1451695A1 (en) * 2001-10-29 2004-09-01 MPNET International, Inc. System, method, and data structure for multimedia communications
US9392002B2 (en) * 2002-01-31 2016-07-12 Nokia Technologies Oy System and method of providing virus protection at a gateway
US7245620B2 (en) * 2002-03-15 2007-07-17 Broadcom Corporation Method and apparatus for filtering packet data in a network device
US7467406B2 (en) * 2002-08-23 2008-12-16 Nxp B.V. Embedded data set processing
US6795441B1 (en) 2002-08-30 2004-09-21 Redback Networks, Inc. Hierarchy tree-based quality of service classification for packet processing
US7339953B2 (en) 2002-08-30 2008-03-04 Redback Networks, Inc. Surplus redistribution for quality of service classification for packet processing
US7283472B2 (en) 2002-08-30 2007-10-16 Redback Networks Inc. Priority-based efficient fair queuing for quality of service classification for packet processing
US20040088425A1 (en) * 2002-10-31 2004-05-06 Comverse, Ltd. Application level gateway based on universal parser
US7304992B2 (en) * 2002-11-22 2007-12-04 Broadcom Corporation Fast flexible filter processor based on range checking and a method of processing based thereon
US20030108030A1 (en) * 2003-01-21 2003-06-12 Henry Gao System, method, and data structure for multimedia communications
JP2004265116A (en) * 2003-02-28 2004-09-24 Toshiba Tec Corp Remote registration method, program, and remote registration equipment
US20040179527A1 (en) * 2003-03-10 2004-09-16 Cypher Robert E. Stripping packet routing prefixes in a computer system network
US7548992B2 (en) * 2003-03-28 2009-06-16 Safenet, Inc. Method for preparing a decision tree for packet processing
US7394809B2 (en) * 2003-03-31 2008-07-01 Intel Corporation Method and apparatus for packet classification using a forest of hash tables data structure
US7363383B2 (en) * 2003-04-23 2008-04-22 Sun Microsytems, Inc. Running a communication protocol state machine through a packet classifier
US20040223486A1 (en) * 2003-05-07 2004-11-11 Jan Pachl Communication path analysis
US7844731B1 (en) * 2003-11-14 2010-11-30 Symantec Corporation Systems and methods for address spacing in a firewall cluster
US7984175B2 (en) 2003-12-10 2011-07-19 Mcafee, Inc. Method and apparatus for data capture and analysis system
US8656039B2 (en) * 2003-12-10 2014-02-18 Mcafee, Inc. Rule parser
US8548170B2 (en) 2003-12-10 2013-10-01 Mcafee, Inc. Document de-registration
US7949849B2 (en) 2004-08-24 2011-05-24 Mcafee, Inc. File system for a capture system
US20060224822A1 (en) * 2005-03-18 2006-10-05 Blomquist Scott A System and method for tagging and filtering electronic data
US7764612B2 (en) * 2005-06-16 2010-07-27 Acme Packet, Inc. Controlling access to a host processor in a session border controller
US7907608B2 (en) 2005-08-12 2011-03-15 Mcafee, Inc. High speed packet capture
US7984180B2 (en) 2005-10-20 2011-07-19 Solarflare Communications, Inc. Hashing algorithm for network receive filtering
US8347373B2 (en) 2007-05-08 2013-01-01 Fortinet, Inc. Content filtering of remote file-system access protocols
US7685271B1 (en) * 2006-03-30 2010-03-23 Symantec Corporation Distributed platform for testing filtering rules
US7817629B2 (en) * 2006-05-12 2010-10-19 Agere Systems Inc. Methods and apparatus for performing network operations on packets of data in response to content of particular user-specified protocol header fields
US9117005B2 (en) 2006-05-16 2015-08-25 International Business Machines Corporation Statistics collection using path-value pairs for relational databases
US7472108B2 (en) * 2006-05-16 2008-12-30 International Business Machines Corporation Statistics collection using path-value pairs for relational databases
US7613682B2 (en) * 2006-05-16 2009-11-03 International Business Machines Corporation Statistics collection using path-identifiers for relational databases
US7958227B2 (en) 2006-05-22 2011-06-07 Mcafee, Inc. Attributes of captured objects in a capture system
US8879388B2 (en) * 2006-05-30 2014-11-04 Broadcom Corporation Method and system for intrusion detection and prevention based on packet type recognition in a network
US7990860B2 (en) * 2006-06-16 2011-08-02 Harris Corporation Method and system for rule-based sequencing for QoS
KR100757881B1 (en) * 2006-09-20 2007-09-11 삼성전자주식회사 Automatic tunneling method and system using network address translation
US20090028150A1 (en) * 2007-07-26 2009-01-29 Telefonaktiebolaget L M Ericsson (Publ) Protocol-Independent Packet Header Analysis
US8539098B2 (en) * 2007-10-17 2013-09-17 Dispersive Networks, Inc. Multiplexed client server (MCS) communications and systems
US8019709B2 (en) * 2007-11-09 2011-09-13 Vantrix Corporation Method and system for rule-based content filtering
US8478764B2 (en) * 2007-11-09 2013-07-02 Vantrix Corporation Method and apparatus for concurrent filtering of multiple components of streaming data
KR100920518B1 (en) * 2007-11-27 2009-10-09 한국전자통신연구원 Apparatus and methdo for packet classification
US8645400B1 (en) * 2008-08-01 2014-02-04 Marvell International Ltd. Flexible bit field search method
US9253154B2 (en) 2008-08-12 2016-02-02 Mcafee, Inc. Configuration management for a capture/registration system
US8352391B1 (en) 2008-08-20 2013-01-08 Juniper Networks, Inc. Fast update filter
US7835357B2 (en) * 2008-09-30 2010-11-16 Juniper Networks, Inc. Methods and apparatus for packet classification based on policy vectors
US7961734B2 (en) 2008-09-30 2011-06-14 Juniper Networks, Inc. Methods and apparatus related to packet classification associated with a multi-stage switch
US8675648B1 (en) 2008-09-30 2014-03-18 Juniper Networks, Inc. Methods and apparatus for compression in packet classification
US7738454B1 (en) 2008-09-30 2010-06-15 Juniper Networks, Inc. Methods and apparatus related to packet classification based on range values
US8798057B1 (en) 2008-09-30 2014-08-05 Juniper Networks, Inc. Methods and apparatus to implement except condition during data packet classification
US8804950B1 (en) 2008-09-30 2014-08-12 Juniper Networks, Inc. Methods and apparatus for producing a hash value based on a hash function
US7796541B1 (en) 2008-09-30 2010-09-14 Juniper Networks, Inc. Methods and apparatus for range matching during packet classification based on a linked-node structure
US8488588B1 (en) 2008-12-31 2013-07-16 Juniper Networks, Inc. Methods and apparatus for indexing set bit values in a long vector associated with a switch fabric
US8111697B1 (en) * 2008-12-31 2012-02-07 Juniper Networks, Inc. Methods and apparatus for packet classification based on multiple conditions
US7889741B1 (en) 2008-12-31 2011-02-15 Juniper Networks, Inc. Methods and apparatus for packet classification based on multiple conditions
US8850591B2 (en) 2009-01-13 2014-09-30 Mcafee, Inc. System and method for concept building
US8433283B2 (en) 2009-01-27 2013-04-30 Ymax Communications Corp. Computer-related devices and techniques for facilitating an emergency call via a cellular or data network using remote communication device identifying information
US8473442B1 (en) 2009-02-25 2013-06-25 Mcafee, Inc. System and method for intelligent state management
US8447722B1 (en) 2009-03-25 2013-05-21 Mcafee, Inc. System and method for data mining and security policy management
US8638793B1 (en) * 2009-04-06 2014-01-28 Marvell Israle (M.I.S.L) Ltd. Enhanced parsing and classification in a packet processor
US8380870B2 (en) * 2009-08-05 2013-02-19 Verisign, Inc. Method and system for filtering of network traffic
US8806615B2 (en) 2010-11-04 2014-08-12 Mcafee, Inc. System and method for protecting specified data combinations
US9282060B2 (en) 2010-12-15 2016-03-08 Juniper Networks, Inc. Methods and apparatus for dynamic resource management within a distributed control plane of a switch
US9276851B1 (en) 2011-12-20 2016-03-01 Marvell Israel (M.I.S.L.) Ltd. Parser and modifier for processing network packets
US20130246336A1 (en) 2011-12-27 2013-09-19 Mcafee, Inc. System and method for providing data protection workflows in a network environment
US9262511B2 (en) * 2012-07-30 2016-02-16 Red Lambda, Inc. System and method for indexing streams containing unstructured text data
KR20140052243A (en) * 2012-10-23 2014-05-07 한국전자통신연구원 Apparatus and method for providing network data service, client device for network data service
US9165078B2 (en) 2013-03-14 2015-10-20 International Business Machines Corporation Row-based data filtering at a database level
US10191743B2 (en) * 2013-12-29 2019-01-29 Intel Corporation Versatile packed data comparison processors, methods, systems, and instructions
US10838893B2 (en) * 2014-05-30 2020-11-17 Apple Inc. Methods for mitigating system interrupts for an electronic device
US9622176B2 (en) * 2014-06-23 2017-04-11 Qualcomm Incorporated Packet filtering for saving power at a user equipment
US11005977B2 (en) * 2016-08-31 2021-05-11 Viavi Solutions Inc. Packet filtering using binary search trees

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994001828A1 (en) * 1992-07-02 1994-01-20 Wellfleet Communications Data packet processing method and apparatus
US5761424A (en) * 1995-12-29 1998-06-02 Symbios, Inc. Method and apparatus for programmable filtration and generation of information in packetized communication systems

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845465A (en) 1973-01-12 1974-10-29 Us Air Force Associative storage apparatus for comparing between specified limits
US4627024A (en) 1983-07-21 1986-12-02 Trw Inc. Window-addressable memory circuit
US4760374A (en) 1984-11-29 1988-07-26 Advanced Micro Devices, Inc. Bounds checker
US5561429A (en) 1986-04-16 1996-10-01 Raytheon Company Content limit addressable memory
US5390173A (en) * 1992-10-22 1995-02-14 Digital Equipment Corporation Packet format in hub for packet data communications system
EP0594196B1 (en) * 1992-10-22 1999-03-31 Cabletron Systems, Inc. Address lookup in packet data communications link, using hashing and content-addressable memory
GB9326476D0 (en) * 1993-12-24 1994-02-23 Newbridge Networks Corp Network
US5509006A (en) 1994-04-18 1996-04-16 Cisco Systems Incorporated Apparatus and method for switching packets using tree memory
US5608662A (en) 1995-01-12 1997-03-04 Television Computer, Inc. Packet filter engine
US5761191A (en) * 1995-11-28 1998-06-02 Telecommunications Techniques Corporation Statistics collection for ATM networks
US5793954A (en) * 1995-12-20 1998-08-11 Nb Networks System and method for general purpose network analysis
US5884033A (en) 1996-05-15 1999-03-16 Spyglass, Inc. Internet filtering system for filtering data transferred over the internet utilizing immediate and deferred filtering actions
US5802054A (en) 1996-08-15 1998-09-01 3Com Corporation Atomic network switch with integrated circuit switch nodes
US6181698B1 (en) * 1997-07-09 2001-01-30 Yoichi Hariguchi Network routing table using content addressable memory
US5951651A (en) * 1997-07-23 1999-09-14 Lucent Technologies Inc. Packet filter system using BITMAP vector of filter rules for routing packet through network
US6304903B1 (en) * 1997-08-01 2001-10-16 Agilent Technologies, Inc. State machine for collecting information on use of a packet network
US6377998B2 (en) * 1997-08-22 2002-04-23 Nortel Networks Limited Method and apparatus for performing frame processing for a network
US6226710B1 (en) * 1997-11-14 2001-05-01 Utmc Microelectronic Systems Inc. Content addressable memory (CAM) engine
US6700891B1 (en) * 1998-06-25 2004-03-02 Cisco Technology, Inc. Apparatus and method for providing a device level security mechanism in a network
US6597694B1 (en) * 1998-06-26 2003-07-22 Cisco Technology, Inc. System and method for generating bulk calls and emulating applications
US6434144B1 (en) * 1998-07-06 2002-08-13 Aleksey Romanov Multi-level table lookup

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994001828A1 (en) * 1992-07-02 1994-01-20 Wellfleet Communications Data packet processing method and apparatus
US5574910A (en) * 1992-07-02 1996-11-12 Bay Networks, Inc. Method for segmenting data packets to form binary decision trees which determine filter masks combined to filter the packets for forwarding
US5761424A (en) * 1995-12-29 1998-06-02 Symbios, Inc. Method and apparatus for programmable filtration and generation of information in packetized communication systems

Also Published As

Publication number Publication date
EP1103129B1 (en) 2010-03-31
ATE463115T1 (en) 2010-04-15
EP1103129A2 (en) 2001-05-30
WO2000008817A2 (en) 2000-02-17
DE69942203D1 (en) 2010-05-12
AU5332299A (en) 2000-02-28
US7133400B1 (en) 2006-11-07

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